화학공학소재연구정보센터
Journal of the American Chemical Society, Vol.139, No.7, 2808-2815, 2017
Controlling Near-Infrared Chromophore Electronic Properties through Metal-Ligand Orbital Alignment
Transition-metal complexes of radical ligands can exhibit low-energy electronic transitions in the near-infrared (NIR) spectral region. NIR band energy and intensity sensitively depend on the degree of electronic coupling of the chromophore. Using the example of open-shell complexes derived from platinum and a 1,4-terphenyldithiophenol, we present a novel approach toward spectroscopically distinct MR dyes for which the degree of electronic coupling correlates with the relative orientation of radical ligand and metal orbitals. Ligand/metal orbital alignment is modulated by auxiliary phosphine donors and selectively results in electron localized Class II-III or delocalized Class III structures that display distinct MR transitions at 6500 and 4000 cm(-1).